Process of extracting grease and oil from garbage.



C. S. WHEELWRIGHT. PROCESS OF'EXTRACTING GREASE AND 01L FROM GARBAGE APPLICATION FILED MT. 2. 1908.

925,97 1 a Patented June 22, 1909.

5 SHEETS-SHEET l,

311 new for '1 A Pram a G. S. WHEELWRIGHT. moms or EXTEAGTING GREASE AND OIL FROM GARBAGE.

APPLIGATION FILED OUT. 3, 1908.

Patented June 22, 1909.

' 5 SHBETSSHEET Z Sum-whoa 0. S. WHBELWRlG-HT. moonss 0F EXTRAOTING GREASE MID OIL FROM GARBAGE. APPLIOATION FILED 01H. 3, 190B.

Patented Eune 19.05

5 SHEETS-SHEET wwnwaw W i W W G. .S. WHEELWRIGHT.

PROCESS OF EXTRACTING GREASE AND 01L FROM GARBAGE.

APPLICATION FILED 0UT.3,1908.

Patented June 22, 1909.

5 SHEETSSHEET 5 UNITE sirarns ra ran oration.

CHA RLES S. WHEELWRItll-ll, O1" BltlhlUL, ltllUlllC lh'llANl).

PBOGESS OF EXTRACTING GREASE AND OIL FROM GARBAGE,

To all whom it may concern:

Be it known that I. Cnannas S. 'nnnil- WRIGHT, a citizen of the United States, residin at Bristol, in the county of Bristol and btate of Rhode Island, have invented certain new and useful Improvements in Processes of Extracting Grease and Oil from (:ra'rbage, ofavhich the following is a specification.

The primary object of the invention is the Continuous operation of the process of extracting grease or oil from garbag the said process consisting in contii'ruously saturatfing the garbage with hot water and draining the "hot Water therefrom continuously forcing the garbage through the vessel in which it is 'so saturated and drained in a hot con dition into a cooking vessel while said cooking vessel is under steam pressure, continuously adding hot Water to said garbage in said cookin vessel andcooking said garbage -therein under steam pressure, continuously removing the garbage in a cooked condition and oil and water therewith from said cooking vessel and thereafter separating the oi-land water from the cooked garlmgc and the oilfrom the water.

The invention is, however, adapted for use in a rendering plant and for other uses.

' The invention consists also in that dctail of said continuous process that hes in the preparation of the garbage for further treatparts being required.

'ment in a digester under steam pressure, the same consisting in continuously saturating .the garbage with hot water, draining the hot water from the garbage and forcing the garbage so saturated and drained in a hot 'condition into said digester under steam pressure.

- The several parts or the apparatus by which the said process is conducted are old. sists mainly of a s eam cooking vessel or di- Such apparatus consists mainly of; a st 2am cooking vessel or digester, a hot waiter tank. ext ractors. the construction and mode of operation of which are fully described in my Patents No. 72131302 dated February 38. 1005. and No. 890,112 dated June 9. 1008, steam and compressed air pipes, trap tanks, air compressors, vapor condensers and pumps. a separator and a swilF'or muck tank, the offices of all of which notfully apparent from their names will be described.

in the drawings :-liigure 1 shows up on Specification of Letters Patent.

Application filed October 3, 1908.

bottom of the cylinder,

Patented June 2:2, 1909.

Serial No. 455,978.

'1 and Fig. 4-: Fig. represents so much oi' the apparatus as is on the ground tloor; Fig. 5 is a longitudinal cross section of an extractor.

A is the cooking vessel or digester, which it is unnecessary to describe further than to say, that it is made in sections with conical ends at. top and both'uu. and, as is the case with the other parts of apparatus used in this process, is air and water tight.

1 is a pipe through which dir'ect steam from a boiler system not shown is admitted to the digester for cooking purposes by entrance pipes 'i 'i in a ring pipe surrounding the lower cone of the digester and connected with said pipe l. (See my .latent No. 77%,80st, dated Nov. 15, 1904.)

1') is an extractor, in this instance used for torcing garbagc intp the digcster or cooking vessel, the said digcster at the time being under steam pressure. The said ex tractor E is connected with the digcstcr by a passageway W lezuling 't'rom the end of the extractor to the dome of the digester which is made in sections as shown.

Uncooked garbage under pressure gives up but a small percentage of grease or oil; consequently no attempt is made to extract oil from garbage in extractor E but hot water is pumped by n pump (l from hot water tank ll, into a passageway \V through which raw garbage des ends to extractor E as will be described to assist the passage of garbage through the extractor and aid in forming a plug of garbage as will appeal. The said extractor r1 fully described in my Patents. No. 783,602 datcd l ebruaiy E28, Haif -and No. 89011; dated June J, i908, but may be briclly dcscrilnrd as consisting of a long horizontal cylinder with a :arrying screw c" closely tilting theiuner periphery of the cylinder, turned by belting from the main power shaft of the apparatus as indicated in the drawings. The said carrying screw in carrying material from one end to the other of said cylinder is aided by metal plates orfinsJai, pivoted in boxes set in said cylinder and by water introduced as hereafter described and drain lates 0' set alon the he said drain plates extractor in my above named patents;

resting on and being supported by inclined l blocks 6" and 6 within a Water tight bed D l along the top of which the cylinder rests and in the top or which the said drain plates are l placed. The said inclined blocks are operl ated by screws connected by suitable gearing l with a shaft 6* on the outside of said bed i), i The said cylinder is furnished with a plug y valve e" which is erated to and from its 1 seat a by a lever under control of the piston of cylinder L -A packing channel 6 just in l front 01- the plug valve 6 of decreasing diamelcr from the screw insures the formation of a plug ol garbage or other material 5 against said plug valve when the same is on l its seat, after which, while the cylinder screw l e is in operation, the plug valve e is more or less opened and the plug of garbage or other material, more or less disintegrated by knives carried by the said valve e which by a clutch mechanism fully described in my Patent No. 890,112, about the operating shaft 1 of screw 0 is made to revolve, is forced through the passageway Vi into the digester A as will hereafter be more fully described. The purpose of the said extractor is not the l extraction of oil or grease from the garbage, since uncooked garbage will ive up little 1 grease or oil, but the insertion of the garbage in the digester while the latter is under steam pressure. The water which is expressed from the garbage is drained oti froin the bed I) which it has entered through drain plates 6 and from the compartment a through drain plate d by pipes l, l, and 1 P to a hot water tank ll, as will be explained, the said drain plate (Z being at the entrance of said pipe P.

E is a second extractor employed in the process, its oflice or purpose being that or the to extract the oil as well water from th garbage which has been coolred in the digester as described in my above mentioned patent and conveying the tankirge through the extractor to a hopper H and then to the drying mechanism here marked Y.

T, T are trap tanks receiving water and oil from extractor E S is a separator in which water and oil remain at the top while water and sediment go to the bottom, the said separating tank being heated by a steam coil in the bottom thereof to assure a melted and operative condition or the grease.

The offices and names of other essential parts of the apparatus employed will appear in a description of pipe andthe apparatus; P, as before stated, is a pipe hroiigh which steam from the boiler system not shown) is admitted to the bottom or" the dig cooking purposes. Compressed air same boilers is admitted through pipe marked P 2 and used in coinpr compressed air from which passes lhit or the interior of the digester A,

thermometer, and V is aviilvc in pipe i compressed air cylinder L controlling, as i will be explained, the entrance of garbage to 5 and through passageway W leading to extractor E; valve mechanism of cylinder If lor opcrating plug valve c" or extractor E;

valve mechanism of cylinder if for operating a rain to clear passageway \V of rags and similar, substances, as described in my pending application, Se. No. iseaoi, dated September 2t 1908; valve mechanism of cylinder if to regulate the passage of cooked garbage and water from the digesterAto tractor ii"; valve mechanism oi? cylinder If to operate the plug valve of extractor i the admission of said compressed air to the cvlindcrs containing the said several valve mechanisms being controlled by hand levers Z, Z, etc, as in most instances shown. Coinpressed air from said air compressor R is also used to force water through various pipes as will appear; I" is a pipe through which sin-ill water is forced from swill water and muck tank T8: to hot water tank ll by virtue of voniprcssed air from said air compressor it admitted through' pipe I 5' to the muck tank ll. l and l are, as before stated,

pipes through which water passes from ere tractor i l to said hot water in l: H.

is a pump by which water is pumped from hot water tank ll through pipe I and a branch thereof P 1 to the middle portion as shown, and through an extension of the some pipe 1" to the passageway W to moisten and ac :ompany the raw garbage in its passage through the extractor E.

l is a pipe leading from the dome at the top of the digester to the bottom of the hot water tank ll tor the purpose of allowing gases and vapor gcllfllilitltl in cooking the garbage to pass oii to the bottom of the hot water tank il.

l is a pipe in the dome of the digestcr, as slioivn provided with a steam gage and which the operator from time to time inanip iilates to open or close more or less by means of a suitable key so that the gas pressure in the digesicr shall not exceed the steam pressure. The steam and vapor thus escaping serve to heat t5 stvill water in the hot water tank ii that has been forced tip from the swill water and muck tank K by compressed air pipe P 5.

ter gravity from the OXlI'ZlLit)" l and P are pipes through which we and oil pass by i the tank v 97 7 from near the iotiom A I i v a to a second trap tank 1- about one-third way up said t ank if is a pipe leading from nae: bottom ITO hditomf iiilp tank 'l and the: bulimia n'i' the r separating tank S. to the will miter :uul muck hank K by whirl: u'zil'e and HNlll'i'Hlii why be drawn from suuh tanks in will iuuc-k prwvicled with a Vfllfi? in he (um-Mull hi luuul required. The sand l'm'p mukx unrl 59p am-liar are made 'wiih'couiczzl lio imn'is to insure he emptying of, their conicui'a.

P is a. pipe leziliz'ig from about one- Lhiid Wag; up ihu s eppratmi' 5w" 0 my 0i grams simmg'e tank I?" from which ii di yipe P leads; from man ltmtlxm'z through the top, as slmwn, for film 1 isclmrge from lhe: uppsmiiu-s 0i llw my oil 0% iniucil 'lrmu Q 21g =1 ih'i'cmgl: m 7 ppm 1 .1 enterin said Ting-h m hi'zmch Hum 00m n: sail sirnaigc mi: 1

oil in the hotumi, as g mme m a leulpi-uruiu .1 l Pipe ii-11 ihe @luuiss mp t lb i I I '"e '11"- i:iiig

cl 1P in siuzapi uumes a HR tl'iir I i and 1"" i iillilifl 'l" and sipzu'izi'or S in carry 01' was: and vapor gs "i'iliill in uial hanks uni pilltifli' w u mu use? H ivlivnce wl'ieu mlwl I-ilil an: discharged by u blower M visa to the siuolzi cl: (INT/f shown) in plant. 'lfhc pipe ill water and much H has in it a l loading fmm ihv i K in the hut warm 12ml;

P'Oili'lll (:hm'k valve in 1 pipu (uni h uch Swill 0 l 1' drained from the groan gm )ugo into the lihmviu :uul llic plug; vulw 1" being on its;

sent, the operator" mzuiipuluiw; lmuzl llYtl' ziuil opens the valve in pi w l" whvi'v it, mum's puramgau'ny W musing mu g'm-lm gu which ('muiuunll 2U'l'l\''S iu llw vuuveyvr zit .lu: hozul (if the apparatus lui'ull lhi-uugli uissugmmy W into lho 0x z'zu-im- E where with ihu aid if u'zilm' piuupwl up from the ll by stvmu pump (1-. ii is fiu'iml by screw uguinsl plug valve (1" until :1 plug of gmlmgo is i'm'uwil. is l)L- lum slziled, fl 1 garbage iluvs iml give up its oil lllHlU'l pressure but the wafer uillmiliwl through pipe i is drained oil'l'hl'ough (li'ziiu plums w' and if. and pipvs I and P to hot wan-r 'tzuil; ii ivliilv the gin-huge is passing lhi-uugh l'hv QXlizHiOl'. in the mean time water from the hut "mile izuik ix i-ziusiiil by pump G u U er the ilig. 102' k lhi'uugii pipe I up to the middle ihcrco'i which is uuilcr usurp l-mu il'CSli slmuu mliuiitml ihi'uu 'h pipe 1 and l'M'flEiCllQ 2'. The spur aim: 110W upm'ul'iw; lru'ui 1mm 1" 1 the r I plug Valve (2* (0 0mm iuni'u 01' la l: p" hitting the pug of raw g 'ui'bmge in iiyliiuhei' E in fall in ii flisiiilogi'nl (ion lulu Sdili iliggomu'. w v :0 UMHJQ is hut ML and H14 uperzit'mu Ofil'li) mii'ncim' 1: smug-ii. FIPPil slcziui, however, coutinuw. in eul'm' Gigi-Flor at :1 pressure of about pounds Quill the cooking of the gmbage is continued 1'01 :11. hour or two; 01 until lhu al-huge in a mndilion to g'wz up its oil under prusssi'u'e. the spent stmini ziiul gusoh pusm'ng 0i? thrnug'h pipe l." iu he dome of i'lm li M121.

:U'l erlseniiul. feuti: v may he well in he (ha 'lxh e (lliifliehgifl matured ills (ligviil'iur a i l sieuiu prawsui'i: in this figuslei', as wtzuml :ihm'e. hucnuue the pressure upon the u'lmgie through c \'limle.1' E Llulifli ,10 new process it The flliL-fuii Airbags has 0 "the 1, 0w on the: plug is vary considerably greater than glue stvum pressure n the (li; M113 When. the. gall;

in ihe (fligiFZlOi .mii itriiuii'ly m'mkml the (we? aim' uuiui iululvs luiuii lm'ms 1 nu l 3'' PM milling the cooked gui'lmgv to fOI'I'El plug in vxlrzicfo E'; the operator finally by inzu' .ipubiting hamcl i lTCl Z" npms the plug Julia of vvlimler E and 'mi'mits Hictlisii'il'egi'zil'ml ii-ililiflgit to lvsceml through the hoppci' H to the (h'iiT-i' 2" llw \\'ill\l' and oil ()Xpl'QHHC-Li from the cookuci gurl'm 'c in its pzmsugc ilu-ough llu axtmqtor l p: ug ihmugh (1m n plates (not shown) and pipes P and P" in ihctrap l'riul; "i", indicatcfi; and the "Kiri-Mill)? E living uow again put open on the pm l'fitCOIHQS continuous. 1 mid he l aiu .lhowm'iri that water must he i; )llt li to the 5:1 i'hzi vutcriug the 15xunulor E" as garbage l; su iqlliutl; and like suflizria-ni rater inusi, at all times from burning. aiul in supply ill" lHlPRmH V water for the proper working of extractor lij. Oil will from time to time appear at the top of the hot water tank H, but under the pressure of water in the hot water tank will pass off through pipe P to the separator S. Glass indicators B are set in the tops of the digester A, the hot Water tank H E to indicate the level of the contents or said vessels. A is a portion of the top of an air tight casing of a conveyer used for bringing up garbage from the garbage vaults in the cellar to the top of the building in which the apparatus is located, plates or scrapers a, a, being attached to an endless sprocket chain and running in a trough with an opening O into which the scrapers (but 2 are shown) deliver the garbage.

\Vith reasonable care exercised by. a skillful operator the process above described is continuous. The solidity of the plug continuously formed in the extractor E and forced into the digester A will be determined by the distance at which the operator keeps open the plug valve c of extractor E and by the supply.

The screw has unlimited power. It may be operated with a pressure, say, of 150 pounds to an inch. The compressed air in the cylinder L should then have (the parts being proportioned as shown in the drawings) a n-essure of about 70 pounds to an inch. The area of the plug valve is about.

four times that of the piston in cylinder L and the leverage about doubles the elfect of the pressure; the result being that the plug valve is operated at a pressure of about 35 pounds to an inch, at which pressure garbage is forced into the cylinder against a pressure of only pounds. It is obvious, however, that these figures may be varied within reasonable limits.

l claim l. The herein described process of extracting grease or oil from materials, the same consisting in continuously saturating the material with hot. water and draining the hot water therefrom, continuotsly forcing. the

' material so saturated and drained into a cooking vessel While said cooking vessel is under steam pressure, continuously adding hot water to said material in said cooking l vessel and continuously cooking the material 3 under said steam pressure, continuously rei movin the material in a cooked condition and oi and water therewith from said cook ing vessel, and separating the oil and water i from the material and the oil from the water.

4 2. The herein described process in the ex- 1 traction of grease or oil from materials, con- I sistlng 1n continuously saturating the mate rial with hot Water, draining the hot Water from the material and forcing the material so saturated and drained in a heated condition into a digester under steam pressure.

The herein described process in the extraction of grease or oil from materials, consisting in continuously saturating the material With hot Water, draining the hot water from the material and forcing the material so saturated and drained in a heated condition into a digester under steam pressure, continuously adding hot water to said material in said cooking vessel and continuously cooking the material under said steam pres sure.

4. The herein described continuous process of extracting grease or oil from materials, the same consisting in continuously saturating the material with hot water and drain ing the hot Water therefrom, continuously forcing the material so saturated and drained into a cooking vessel while said cooking vessel is under steam pressure, continuously adding hot water to said material in said cooking vessel and continuously cooking the material under said steam pressure, continuously removing the material in a cooked condition and oil and water therewith from said cooking vessel, and separating the oil and water from the material and the oil from the water, the said water by Which the material is saturated and by which it is cooked being supplied from water drained or separated from the material and oil in the continuous process.

in presence of two Witnesses.

CHARLES S. VVHEELWRIGHT.

Witnesses WILLIAM W. SWAN, Ina E. HANDREN.

In testimony whereof I afiix' my signature 

